Voice-transmitting device



May 19, 1925. 1,538,321

' c. H. GUNN VOICE TRANSMITTING DEVI CE Filed June 20-. 923

minimu WWW T MIHHTIM ll 6 i m y m i T K r I k? if 1 I (/6 12 v ll f FT:S 17 J i 3 I N VEN TOR. (7h (Ill as H. Gun 12 Q mm ATTORNEY Patented May19, 1925.

CHARLES H. GUNN, OF OAKLAND, CALIFORNIA.

VOICE-TRANSMITTING nnvrcn Applicationflle dlune 20, 1823. Serial No.646,524.

To all whom it may concern:

Be it known that I, CHARLES H. GUNN, a citizen of the United States,residing at Oakland, in the county of Alameda, State of California, haveinvented certain new and useful Improvements in Voice-TransmittingDevices; and I do declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, and to the figures of reference marked thereon, which form apart of this ap lication.

his invention relates to a device for throwing the human voice throughthe air for a greater distance than it will ordinarily carry, theprincipal object of the invention being to' provide a device for thepurpose which will take the place of, the megaphone usually used, andwhich, instead of ein held to the mouth by the speaker, will e in theform of a self sup orting yet portable stand, having a mouthpiece towardwhich the speaker will direct his voice without the necessity of hishaving to place his mouth directly against the mouth iece as isnecessary with megaphones, but ronr which his voice will be carried tohis audience clearly and with an increase in volume, as far away fromthe s eaker, within reasonable limits, as may e desired, without thespeaker having to raise his voice above a natural speakin tone.

My device is a apted for use in speaking to any public gatherings,whether 1n halls or auditoriums or in the open air, and relieves thespeaker both from the voice and arm strain incident to the use of amegaphone.v I

As above intimated, the distance to which the .voice may be thrown maybe varied at the will of the speaker, and also the direction in which itwill be projected relative to the speaker, within limits, may also beeasily regulated and changed, without alteration of position on the partof the speaker.

The above and other objects I accomplish by means of such structure andrelative arrangement of parts as will be fully evident from a perusa ofthe following specification and claim.

On the drawings, similar characters of reference indicate correspondingparts in the several views, in which: i

Fig. 1 is a perspective view of the device.

Fig. '2 is a vertical side section thereof.

Fig. 3 is a bottom plan view of the same.

In carrying out my invention in the preferred manner, I provide a base 1mounted on threelegs 2, each individuall and swiv-. elly mounted on andprojecting ownwardly from the base from between ears 3 thereon, clampingmeans being provided to hold the legs in any set position, such as forinstance wing-nuts at on the swivel-pins 5 of the legs which passthrough the ears.

Mounted on and projecting upwardly from the. base is a casin orcontainer 6, preferably of wood an rectangular in shape, and surmountedby a top piece 7 arranged to serve as a book or paper support or forlike purposes. The base members 6, and top 7 form a complete enclosure.

Mounted in the casin a short distance from the top thereof an extendingtransversely therethrough from'front to back is a tube 8 on one'end ofwhich, outside the casing, is fitted a transmitting horn 9 of suitablesize and shape, and on the other end a receiving born or mouthpiece 10.The

tube 8 preferably has an upward bend intermediate its. ends toward themember 10 so that the latter is facing somewhat upwardly and is thus ina goodposition to receive the voice from the mouth 'of the speaker,which would be ordinarily some- I what behind and above the mouthpiece.

Also the mouthpiece 10 preferably has a tube 11 of its own, slidable inthe adjacent portion of the tube 8, so that the position of themouthpiece relative to the casing may be adjusted to suit theconvenience of different speakers.

Mounted on the base 1 inside the casing is an electric motor 12 whichdrives a horizontally disposed fan 13 thereabove. The motor and fan areenclosed in a hood 14: supported on the base and spaced from the wallsof the casing. Above the fan the hood forms an inverted funnel 15 whichterminates in a nozzle 16 projecting into the tube 8 and facing towardthe horn 9.

The nozzle flares out somewhat. toward its outer end, so as to preventany possibility of there being a whistling sound at that point as theair emerges. I

The base 1 below the motor is provided with orifices 17 a damper 18being arranged thereunder so that the. sizes of said orifices,

through which air passes to the fan, may

be regulated to suit.

The entire casing 6, about the hood and tube 8, is preferably filledwith cotton 19 or some similar material which will deaden any possiblenoise and vibration set up by the the voice of a speaker talkingadjacent the mouthpiece, even though at some little distance therefrom,will be drawn into the tube 8 toward the nozzle, and will then be thrownfrom the horn by and with the blast of air issuing therefrom, so thatthe voice will be audible at a considerable distance from the horn, thisdistance being governed by the velocity of the air blast and by itsvolume, which in turn are governed by the speed of the fan andregulation of the damper.

To suit persons of different heights who may speak into the device, itis only necessary to adjust the legs to raise the level of themouthpiece and casing as a whole. If it is desired to throw the voiceeither higher or lower, only that leg under the side of the device onwhich'the horn is mounted is raised or lowered, thereby similarlyadjusting said a horn, and causin the outwardly issuing blast to bedirecte up or down.

From the foregoing description it will be seen that I have produced adevice which substantiall fulfills the objects of the invention, anwhile I have here shown and described a specific arrangement of parts, Ireserve the right to make such deviations from this showing as do notform a departure from the spirit of the invention, as defined by theappended claim.

Having thus described my invention, what I claim as new and useful, anddesire to secure by Letters Patent is v A live voice transmitting devicecomprising a tube having an enlarged transmitting end, and a receivingmouth-piece at its other end, said tube being freely open from end toend, and means for developing an air blast at a point removed from thetube and discharging it into the tube at a point intermediate the endsof the tube and in the direction of the transmitting end whereby soundwaves of the voice will be drawn freely into and through the open tubeand discharged forceably out of such transmitting end.

In testimony whereof I aflix 111 Si ature.

- CHARLES G N.

